Is this a scar or skin cancer? (Photo)

Hi im 20yr Old male and I just scratched on my back and found a weird bumpy patch, it looks just like a scar but I'm not sure.. the only thing was I Hurt my back one yr ago on a waterslide but I dont know if this causes the scar or that this patch had already been there then.. Its the spot in the above half of fhe photo

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